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  1. Engine Management Systems
    Hey everyone, I have 1990 mustang lx 5.0 and my check engine light comes on when accelerating lightly when my engine is cold once it warms up the light goes away. It does not stay on just when I'm accelerating lightly from 1500 to 3000 after that it goes off. I bought an actron obd1 tester and I...
  2. 5.0/5.8 Engine Tech
    I had written in earlier regarding my 1989 5.0 Mustang. In October a new Jasper engine was installed after 309,000+ miles of wonderful driving! - and since then I have had electrical problems and discovered I cannot run codes KOER, but can run codes KOEO. I chose to keep my car because 1) I...
  3. General Mustang Tech
    So this is a new one to me... I just completed a cam and intake upgrade on my 91 GT (TF Street, E303, 70mm TB, stock heads) and now when I turn the key to "run" the computer lets out a series of loud beeps: 5 beeps 5 times then it goes away. Does this every time whether I leave the key in "run"...
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